2 results about "Active cancellation" patented technology

The application discloses a radar target active stealth test system and test method based on active cancellation, and relates to the electromagnetic field and microwave technology field.The technical scheme points of the application are as follows: the test system and test method for reducing the target RCS by actively emitting electromagnetic wave signals to cancel the scattered echo by using the retransmission type amplitude modulation phase shift active cancellation circuit.The active stealth system based on active cancellation comprises a radar signal frame receiving antenna, a retransmission type active cancellation circuit module, a control system program and a cancellation parameter library, and a cancellation wave signal emitting antenna.The target RCS is reduced under the condition of a specific frequency after the vector synthesis of the scattered echo of the target and the cancellation wave signal generated by the cancellation antenna, and the active stealth effect is achieved.The test system of the application is suitable for the cancellation of various radar signal wave forms including continuous wave and step frequency wave, has high cancellation precision, and the hardware equipment and test method involved are simple and easy to realize.

A simultaneous transmit and receive (STAR) system comprises a plurality of radiating elements and a plurality of antenna transmit / receive (T / R) elements. The plurality of antenna T / R elements are each in operable communication with a respective radiating element. Each T / R element comprises a transmit channel, a receive channel, a switch, and a directional coupler. The directional coupler comprises an RF input in operable communication with an antenna array receiving signals, an RF output coupling the received signals to an input of the receive channel, and a coupled input operably coupled to the switch. If the switch is set to a predetermined state, the respective transmit channel couples an active cancellation signal to the coupled input of the directional coupler to cancel at least some coupling effects arising on an input to the receive channel, arising from operation of at least some of the T / R elements in the array.